Not many cases of internal poisoning by Rhus toxicodendron are on record in medical literature.
"Some Constituents of the Poison Ivy Plant: (Rhus Toxicodendron)"
William Anderson Syme
The variety R. toxicodendron radicans has ample foliage, and is suited for similar places to the last.
"Hardy Ornamental Flowering Trees and Shrubs"
A. D. Webster
In February 1853, Dr. Arnott had forwarded to him a watery extract prepared from the root of a tree, described as 'Wabie,' a toxicodendron from the Somali country on the Habr Gerhajis range of the Goolies mountains.
"First Footsteps in East Africa or, an Exploration of Harar"
Richard F. Burton